https://peterjackson.mee.nu/where_i_work#c2746">https://peterjackson.mee.nu/where_i_work#c2746. A top quality roofing system will have them mounted all around the edge of the roofline, where upright wall surfaces https://brianqxel114051.bluxeblog.com/71716088/stay-dry-roofing-things-to-know-before-you-get-this